400400000004 has 24 divisors (see below), whose sum is σ = 938382385248. Its totient is φ = 132878706880.

The previous prime is 400399999997. The next prime is 400400000029. The reversal of 400400000004 is 400000004004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73492137 + ... + 73497584.

It is an arithmetic number, because the mean of its divisors is an integer number (39099266052).

Almost surely, 2^400400000004 is an apocalyptic number.

It is an amenable number.

400400000004 is an abundant number, since it is smaller than the sum of its proper divisors (537982385244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400400000004 is a wasteful number, since it uses less digits than its factorization.

400400000004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146989955 (or 146989953 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

Adding to 400400000004 its reverse (400000004004), we get a palindrome (800400004008).

The spelling of 400400000004 in words is "four hundred billion, four hundred million, four", and thus it is an aban number.